Nowadays, there are many kinds of mobile power supplies on the market. When we choose mobile power, in addition to comparing its appearance and portability, we often compare the parameters of mobile power. So, what are the main performance parameters worth mentioning for mobile power? Xiaobian made an induction here:
Capacity (mAh): The charge battery is mAh, which is the product of current intensity and time. When the current intensity is in milliamps (mA), the time is measured in hours (h). Multiplication is mAh. It represents the time of complete discharge at a certain discharge current, for example, 1000 mAh means that the battery can be discharged for 1 hour at a current of 1000 mA.
The capacity division of mobile power is not too strict. The general mobile power capacity is around 1000mAh-12000mAh. Considering that the battery capacity of mainstream smartphones is generally around 2000mAh (such as the battery capacity of Xiaomi M2 is mAh, the battery capacity of Samsung i9300 is 2100mAh), so we divide the mobile power into 2000mAh or less (one-time charge, consider portability), 2000-5000mAh (can charge the phone 1-2 times), 5000mAh-10000mAh (can charge the phone multiple times, or Charge the tablet) and four levels above 10000mAh (charge multiple devices), and evaluate the different models of mobile power in these four grades in the subsequent evaluation.
We also want to point out that for mobile power, the bigger the capacity, the better. After all, capacity is just a parameter that can measure the usage time. When purchasing, you should choose according to your own habits and actual needs, and avoid blind pursuit of "large capacity."
It is also worth noting that the capacity of the mobile power supply generally refers to the capacity value indicated by the manufacturer on the outer packaging of the product. This capacity value generally refers to the capacity value of the internal battery of the mobile power supply, rather than what many consumers think. The actual capacity value that can be used.
Output voltage (V): imitation computer USB port and mobile phone charger, generally 5V;
Output Current (mA): The current common output current standards are 500mA, 1000mA (1A) and 2100mA (2.1A). The first two are generally used to charge mobile phones, while the latter are commonly used in larger mobile power supplies to charge tablets. As with capacity, the output current is an important indicator to consider when choosing a mobile power supply. This is because, at the same voltage, a current that is more similar to the nominal parameter of the device being charged can make the charging process more efficient. Regarding the influence of different output currents on the charging efficiency of the device, the love machine will also be verified in the subsequent tests.
Input voltage (V): imitation computer USB port and mobile phone charger, generally 5V;
Input current (mA): Similar to the mobile power output current directly affects the charging efficiency of digital products, the input current of the mobile power supply will also directly affect the charging efficiency of the mobile power. For example, a 12000mAh mobile power supply, if the rated input current is only 500mA, means that it takes more than 20 hours to fill the mobile power supply; but if the rated input current is 2.1A, then it takes about 7 hours, That is, the time to sleep at night can be full.
A brand of 12000mAh large-capacity power supply with a rated input current of 2.1A
Conversion rate (%): In layman's terms, the conversion rate of mobile power is the conversion efficiency when the internal cells of the mobile power source are charged and discharged. For example, in theory, a 5000mAh mobile power supply can be fully charged in 5 hours if it is charged with a 5V/1A cross-flow power supply, but in reality this is not possible. This is because whether it is the internal power and protection board of the mobile power supply, the power interface, etc., there will be some loss during the charging and discharging process, including:
Circuit conversion loss;
Self-operating loss;
Boost loss; and so on.
The boost loss is the reason why we feel "why the capacity of the mobile power supply is not as big as we think." The discharge voltage of lithium battery cells used in mobile power is generally around 3.7V-4.2V, while the standard input voltage of digital products such as mobile phones is 5V. Therefore, the mobile power supply needs to pass the internal boost circuit to output 5V voltage to charge the mobile phone. There will be some losses in this.
Simply put, the so-called "capacity" simply represents the discharge capacity of the mobile power source at the nominal voltage output and the specified current, and does not really represent the real energy of the mobile power source. The energy of the battery is in watt-hour (Wh), which is the product of the capacity (mAh) and the rated voltage (V). For example, a 5000mAh mobile power supply, the capacity here is the capacity of the lithium battery cell, and the rated voltage is 3.7V. Therefore, its energy should be 5000mAh*3.7V/1000=18.5Wh, but if it is boosted to 5V and output, its effective output power is 18.5Wh/5V*1000=3700mAh, which is what we may find in use. A nominal 5000mAh mobile power supply may not be able to charge a 1440mAh iPhone 5 for 3 times.
The conversion efficiency of the battery directly determines the quality of the mobile power supply. In general, the discharge conversion rate of imported batteries is 85%, and the domestic A products are about 75%-85%.
The above are just some of the main performance parameters that can help users to choose mobile power, but the mobile power market is mixed, the virtual standard capacity, parameters and other phenomena are also emerging, not only pay attention to parameters when buying, but also pay attention to the experience of others.
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